Run Powershell stuff on WinDOwS

pwsh.rb

# frozen_string_literal: true

# vi:ft=ruby

autoload :Base64, 'base64'
autoload :Open3, 'open3'

module Pwsh
  extend self
  
  def unfreeze(obj)
    ::Marshal.load(::Marshal.dump(obj))
  end
  
  def encode_cmd(cmd)
    ::Base64.strict_encode64(cmd.encode('utf-16le'))
  end
  
  def output_filter(output)
    output.split(/\r?\n/).count > 1 ? output : output.chomp
  end

  def run(cmd, exe: nil)
    exe = 'pwsh.exe' if exe == :pwsh
    exe ||= 'powershell.exe'
    cmd = encode_cmd(cmd)
    output, result = ::Open3.capture2(exe, '-encodedCommand', cmd, err: 'NUL')
    result = unfreeze(result)
    result.tap { |self_| self_.define_singleton_method(:output) { ::Pwsh.output_filter(output) } }
  end
end

### Example

# if (st = Pwsh.run(%{Get-Uptime | %{$_.TotalSeconds}}, exe: :pwsh)).success?
#   puts st.output
# else
#   warn 'ERROR'
#   exit 1
# end